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The equation of a plane progressive wave...

The equation of a plane progressive wave is ` y = 0.9 "sin"4 pi [t - ("x")/(2)]` . When it is reflected at a rigid support , its amplitude becomes `(2)/(3)` of its previous value. The equation of the reflected wave is

A

` y = 0.6 "sin" 4 pi [ t + (x)/(2)]`

B

` y = -0.6 "sin" 4 pi [ t + (x)/(2)]`

C

` y = 0.9 "sin" 8 pi [ t - (x)/(2)]`

D

` y = -0.6 "sin" 4 pi [ t + (x)/(2)]`

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